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The Earliest Formed Crystals (Phenocrysts)in a Magma Tend to Be

Question 187

Multiple Choice

The earliest formed crystals (phenocrysts) in a magma tend to be ________.


A) crowded and irregular in shape
B) small and clouded with inclusions of everything that formed later on
C) those that can form only at the lowest temperatures
D) larger and well formed because they have space to grow and a ready supply of ions

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